This site is an effort by county, state, and Federal agencies and Indian Tribes to coordinate and aggregate information for Washington communities affected by smoke from wildland fires. The information is posted here by the agencies themselves while volunteers built and maintain the page.
7/18/2017 Smoke in Northern WA coming in from large BC fires
The smoke issues we are seeing in parts of Washington are due to large areas of wildfire to the north of us in British Columbia where 40,000 people have been forced from their homes. Our blog map shows the widespread fire detects obtained from satellites (zoom out on the blog map or click on the link below it that says "full map"). They may get some rain by Thursday. All the best to our northern neighbors.